Docker Networking
Blog post from Elastic
The blog discusses network considerations for using Docker with an Elasticsearch cluster, specifically focusing on different Docker networking setups: none, host, bridge, and overlay. The none network disables networking, making it unsuitable for Elasticsearch, while the host network, though offering high performance, poses security risks. The bridge network is the default setup where containers have virtual Ethernet interfaces connected to the docker0 bridge, allowing internal container communication and external connectivity through IP forwarding and iptables. For Elasticsearch, specific configurations are needed to ensure external accessibility and node discovery, such as setting the network.publish_host and configuring Zen Discovery. Docker containers are configured for IPv4 by default, but can be switched to IPv6 for inter-host communication. Overlay networks, recommended for multi-host setups, require a key-value store for node discovery, with Docker supporting Consul, etcd, and ZooKeeper for this purpose.
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